Steel fiber reinforced concrete

Steel fiber reinforced concrete

1. STEEL FIBER REINFORCED CONCRETE Project by Shaswat Mohan Routray Pravash Sathpathy Nibedta Hansda Guided by Mrs. Priyadarshini Das

2. Contents

3. INTRODUCTION Concrete is strong in compression but weak in tension. As concrete is brittle material the failure in concrete due to tension is sudden. There are also cracks in concrete due to shrinkage and these micro cracks propagate and leads to failure. To safeguard the concrete against flexural cracks fibres are used in concrete section which is known as fibre reinforced concrete

4. Fiber reinforced concrete Fiber - reinforced concrete ( FRC) is   concrete  containing fibrous material which increases its structural integrity. It contains short discrete  fibres  that are uniformly distributed and randomly oriented. Fibres include steel fibres ,   glass fibres,   synthetic fibres  and  natural fibres  – each of which lend varying properties to the concrete. In addition, the character of fibre-reinforced concrete changes with varying concretes, fibre materials, geometries, distribution, orientation, and densities.

5. Steel Fibres Write abt steel fibres and pic

6. Objective

7. Material Used Cement water Coarse aggregates Fine aggregates Steel fibres

8. Cement The cement used is pozzulana portland cement manufactured by Ultratech cement. Specific gravity of cement = 3.05 Fineness modulus of cement = 2.9

9. Coarse Aggregates Coarse agregates avialable locally were used. Specific gravity of aggregates = Water absorbtion by the aggregates= 1.30 % The sseive analysis of 20mm and 10 mm aggregates are shown below

10. Fine aggregates Locally avialable sand from banks of river Brahmani was used . Specific Gravity of sand = 2.57 Seive analysis of sand was done and the sand was found to be of zone II.

11. Steel Fibres Corrugated steel fibres were used in this project with the following properties:- Length = 25 mm Diameter of steel fibre = 0.50 mm Aspect ratio = 50

12. Methodology Calculation of mix design. Casting of cubes and beams. Curing in water for required number of days. Testing of cubes and beams for compressive strength and flexural strength respectively.

13. Mix Design For 1 m 3 of M25 grade concrete Cement = 400 Kg Water = 200 Kg Coarse aggregates = 1185.83 Kg Fine aggregates = 671.90 Kg

14. Mix Design For SFRC For Varying Percentage Of Steel Fibre Sl.No . Steel fibre in % W/C ratio Cement (in kg/m 3 ) Water (in kg/m 3 ) Coarse aggregates (in kg/m 3 ) Fine aggregates (in kg/m 3 ) Steel fibre (in kg/m 3 ) 1 0.25 0.50 400 200 1185.83 671.90 100 2 0.50 0.50 400 200 1185.83 671.90 200 3 0.75 0.50 400 200 1185.83 671.90 300 4 1.0 0.50 400 200 1185.83 671.90 400 5 1.25 0.50 400 200 1185.83 671.90 500 6 1.5 0.50 400 200 1185.83 671.90 600

15. Casting Of The Concrete Beams And Cubes The required mix was prepared. Steel fibres are uniformly put on concrete and mixed thoroughly. The concrete was casted in cubes and beams The casted members are vibrated to remove air pockets . Vibration is done so that there is no segregation of steel fibres.

16. results

17. conclusion

18. reference